Licensing:Imlib2

Copyright (C) 2000 Carsten Haitzler and various contributors (see
AUTHORS)
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies of the Software and its Copyright notices. In addition
publicly documented acknowledgment must be given that this software has
been used if no source code of this software is made available publicly.
This includes acknowledgments in either Copyright notices, Manuals,
Publicity and Marketing documents or any documentation provided with any
product containing this software. This License does not apply to any
software that links to the libraries provided by this software
(statically or dynamically), but only to the software provided.
Please see the COPYING.PLAIN for a plain-english explanation of this
notice and it's intent.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

It also comes with this "Plain English Copyright Notice" in COPYING.PLAIN:

Plain English Copyright Notice
This file is not intended to be the actual License. The reason this file
exists is that we here are programmers and engineers. We aren't lawyers.
We provide licenses that we THINK say the right things, but we have our
own intentions at heart. This is a plain-english explanation of what
those intentions are, and if you follow them you will be within the
"spirit" of the license.
The intent is for us to enjoy writing software that is useful to us (the
AUTHORS) and allow others to use it freely and also benefit from the
work we put into making it. We don't want to restrict others using it.
They should not *HAVE* to make the source code of the applications they
write that simply link to these libraries (be that statically or
dynamically), or for them to be limited as to what license they choose
to use (be it open, closed or anything else). But we would like to know
you are using these libraries.
We simply would like to know that it has been useful to someone. This is
why we ask for acknowledgement of some sort.
You can do what you want with the source of this software - it doesn't
matter. We still have it here for ourselves and it is open and free to
use and download and play with. It can't be taken away. We don't really
mind what you do with the source to your software. We would simply like
to know that you are using it - especially if it makes it to a
commerical product. If you simply e-mail all the AUTHORS (see COPYING
and AUTHORS files) telling us, and then make sure you include a
paragraph or page in the manual for the product with the copyright
notice and state that you used this software, we will be very happy. If
you want to contribute back modifications and fixes you may have made we
will welcome those too with open arms (generally). If you want help with
changes needed, ports needed or features to be added, arrangements can
be easily made with some dialogue.
Carsten Haitzler <raster@rasterman.com>